Aluminum Tris(8-hydroxyquinoline)

Title: Aluminum Tris(8-hydroxyquinoline)
CAS Registry Number: 2085-33-8
CAS Name: Tris(8-quinolinolato-kN1,kO8)aluminum
Additional Names: tris(8-hydroxyquinoline)aluminium; Alq3
Molecular Formula: C27H18AlN3O3
Molecular Weight: 459.43
Percent Composition: C 70.59%, H 3.95%, Al 5.87%, N 9.15%, O 10.45%
Literature References: Metal chelate; fluorescent solid-state material for organic light-emitting devices (OLED). Prepn: R. Berg, Z. Anal. Chem. 71, 369 (1927); I. M. Kolthoff, E. B. Sandell, J. Am. Chem. Soc. 50, 1900 (1928); of analogs: H. Jang et al., Synth. Metals 121, 1667 (2001); of solid state: A. K. Saxena, Synth. React. Inorg. Met.-Org. Chem. 29, 1747 (1999). Exists as two geometric isomers mer- and fac- with several crytalline forms. Crystal structure and optical properties of a, b, and g-forms: M. Brinkmann et al., J. Am. Chem. Soc. 122, 5147 (2000); of blue luminescent d-form: M. Cölle et al., Adv. Funct. Mater. 13, 108 (2003). Photoemission at thin-film faces: W. Zhao et al., Chem. Mater. 16, 750 (2004). Reliability and degradation study: Z. D. Popovic, H. Aziz, IEEE J. Sel. Top. Quantum Electron. 8, 362 (2002). Use in OLEDs: C. W. Tang, S. A. VanSlyke, Appl. Phys. Lett. 51, 913 (1987); G. Baldacchini et al., Proc. 149th Int. School Phys. Enrico Fermi Rome 2002 561-567; as functionalized polymer: A. Meyers, M. Werk, Macromolecules 36, 1766 (2003). Review as emitting material for electroluminescence: C. H. Chen, J. Shi, Coord. Chem. Rev. 171, 161-174 (1998).
Properties: Light yellow complex, 330° (dec) (Jang); also reported as mp 340° (dec) (Saxena). Sublimes >500 K. uv max (0.1 mg/ml): 316, 372 nm; uv max (THF): 391 nm. Fluorescence max (0.09 mg/ml): 509 nm. Photoluminescence (THF): 516 nm; electroluminescence: 528 nm. Luminance max: 3400 cd/m2 at 13 V.
Melting point: 330° (dec); mp 340° (dec) (Saxena).
Absorption maximum: uv max (0.1 mg/ml): 316, 372 nm; uv max (THF): 391 nm
Use: In OLEDs as an electron transport and/or light emitting layer.
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